ogsf: Remove an extra comment

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@72981 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/ogsf/gsd_prim.c

@@ -462,7 +462,6 @@ void gsd_frontbuffer(void)
 
 /*!
    \brief Draw to the back buffer
-   \param bool non-zero for enable otherwise disable back buffer
  */
 void gsd_backbuffer(void)
 {